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Then other relatives and friends contacted Paige to let her know that they had also received the same message.

Someone was pretending to be Madison.

“It’s so horrible that someone made a fake account in her name. We have no idea who did this,” Paige said.

“It honestly made me feel just sick to my stomach to think that someone out there went to the effort to set up an account in her name.

“And then they went to the trouble of searching her family and friends and adding them, why would you even do that? It’s so messed up. What did they hope to achieve?”

Madison had been travelling on 'the adventure of a lifetime" with her best friend when she was killed, her family say. (Supplied)Twins Paige and Madison Lyden. (Supplied)

A relative reported the fake account to Facebook, who deleted the troll’s page.

But the family’s devastation was then compounded when Paige noticed that Madison’s real Facebook account was also deleted hours later.

“Madison’s account is gone, there is no trace of it and we are all so upset. Her Facebook page was a great way to remember her and now it feels like another piece of her is gone,” Paige said.

Paige said she and other relatives had tried contacting Facebook asking for them to reactive Madison’s real page, but their pleas had gone ignored.

Without Madison’s account, many precious photos of her sister have been lost forever, she said.

“Madison’s computer had about three or four years’ worth of photos but all her photos from high school are on that account and we didn’t feel the need to copy them,” Paige said.

“They were on her Facebook why would we save them. So now they’re all gone.”

Paige said it felt like another part of Madison was gone when they lost her Facebook account. (Supplied)

After being contacted by Nine.com.au yesterday, Facebook moved to reactivate Madison’s memorialised account.

It is understood her account was removed by mistake when the fake account was deactivated.

“I’m relieved that we have her Facebook back, but it’s disappointing that her account was deactivated without confirming with anyone from her family, and also that we needed the help of a news reporter to get it back,” Paige said.

Madison, originally from Tasmania, was holidaying with a friend in the Big Apple when she was killed.

The driver of the truck which hit Madison, Felipe Chairez, 44, is facing drink driving charges.

Two beer cans were found in the cabin of his truck and his blood alcohol level was between 0.04 and 0.06, according to court documents.

The Uber driver, Jose Peralta, who was stopped in the lane Madison was riding in has not been charged.

Madison Lyden with her mother Amanda Berry at Deakin University where she had recently finished her honours degree in psychology. (Supplied)

Previously, Madison’s family has spoken of their outrage that Mr Peralta has not been held accountable for her death.

In an open letter, the twin’s mother Amanda Berry, took aim at Manhattan District lawyer Cy Vance for not bringing criminal charges against Mr Peralta.

“Vance’s failure to prosecute reckless drivers is sheer cowardice, and as long as he continues to indulge such dangerous behaviour, pedestrians and cyclists will continue to die on Manhattan streets,” the letter said.